Add 18/21 and 84/8
1st number: 18/21, 2nd number: 10 4/8
18/21 + 84/8 is 159/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
18/21 = 18 × 8/21 × 8 = 144/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
84/8 = 84 × 21/8 × 21 = 1764/168 - Add the two like fractions:
144/168 + 1764/168 = 144 + 1764/168 = 1908/168 - 1908/168 simplified gives 159/14
- So, 18/21 + 84/8 = 159/14
In mixed form: 115/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21+84/8 18/42+84/8 18/21+84/16 54/21+84/8 18/63+84/8 18/21+84/24 90/21+84/8 18/21+84/40 18/21+84/56